Thehikaku.net W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Obsolete doctype. Expected “<!DOCTYPE html>”.
Bad value “jp” for attribute “lang” on element “html”: The language subtag “jp” is not a valid ISO language part of a language tag.
Bad value “Content-Style-Type” for attribute “http-equiv” on element “meta”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Saw “<” when expecting an attribute name. Probable cause: Missing “>” immediately before.
End tag had attributes.
No “p” element in scope but a “p” end tag seen.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “type” attribute is unnecessary for JavaScript resources.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in Japanese but the “html” start tag has “lang="jp"”. Consider using “lang="ja"” (or variant) instead.
Japan JP